President Obama appeared on "The Tonight Show" with Jay Leno Wednesday.Photo: AP

So that’s where it all began.

President Obama poured kerosene on his rift with business icon Donald Trump in a Wednesday “Tonight Show” appearance, saying their disagreement dates back “to when we were growing up together in Kenya.”

Trump has been one of Obama’s leading “birther” critics, arguing that Obama was born outside of the United States.

“We had constant run-ins on the soccer field. He wasn’t very good,” Obama told Jay Leno. “When we finally moved to America, I thought it would be over.”

Obama’s comments came hours after Trump released a video announcing that he’ll give $5 million to the charity of Obama’s choosing if the president releases his college records, along with other documentation.